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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c04c85dd803d7e52fda6b4e1e74e1647e923e4c7e43cb409c83587bb506e44a' 
  AND token = 'yN9IVEGbfZlzA120EE7ZicBVGJC8aBOQxv8jFQgMQ4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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