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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64cfb6a39f14ee41b9acb0e26b2124662bcf0a5537cd550ca33fcf3aa7b4d555' 
  AND token = '2CRDGvDeMeia7W2dcKsbnI9L37QFcmoNkCnJ5fkHtpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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