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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd13f556aee721f9566eda9d9ec4f93ebc3116cda09c4e679398fa1a51a252562' 
  AND token = '+EZiT+bliMQnZexm8AKs3C8VouNYYpgcRBkfUryCDsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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