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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd216cefa1f233b554a64e13eac65598f851ea597ba4941646f5c90b15a3db9e1' 
  AND token = 'HqQWVk3Z0z6OeDxVtuFXninIf3BDT/hcMkdKTnGg76s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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