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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b296ffbc8c19a7ee2e800005a24fe06843b582c386faee0a87b85821348cebaa' 
  AND token = 'PLcx1uLfR+ypaYlfKGf5jRMAvDnsYbihODZL/qoEc+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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