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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b095b593800cda0064a4e063b2885a890e8d8ab4413deb5cdf7a59f4520cd9a8' 
  AND token = 'PR+qoYXu2x21hFYPXCRCl37I4Hy2Fx7ADHf/IF8H5yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}