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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e87ce048b143ba24c723d6cdd05f246e18a6eb7b6be2991e715fa9d1154b26ea' 
  AND token = 'fPMYUxFXEXdd9MA3X9Enssy0gpJP5nKnPC6lv0i8gL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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