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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f08dd8c90fe031ab05336ffe2a2b5f2bd187ad035725e64eec79f154930d54f3' 
  AND token = 'f4qDlYoDowwxbaLhYaRyeJ2Ne5LsL9wd2B4H+j+y/44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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