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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe7753082b829b5174174de0d14d2546011331a0928e554fb50e723e6aa20a4a' 
  AND token = 'pQw5eSAF9S66iCU0nCC998G2yfjL/3VjqFlljZYV070=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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