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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc7552ba3023af7c8f62f29284de6e5a0712a10e2ca587431461d0fa7e289089' 
  AND token = 'lk55wMAuEElQj23TOCkEWdjbA8HHXm4wgir27vXsY8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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