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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c37cc0a0055f17ecfecb6cc80cd807d22c4023b198d6e2fcb6684f8a26b1da1' 
  AND token = 'cKzmggSvWHVsdp4vGgC5y98rI7EoxlkoJrbnHeMeLqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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