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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bffe6a85eabc2f1235e591705ab1c9ede1c09b1321383cc6964080264d80a4e' 
  AND token = 'zOI/CuTJ5PR95TCgknQRi90fVWRWDiZoiO7IxiI3MWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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