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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1ca1c068fb16891a8faa865658fa77b2238758c86970907590c303f3b3c57b9' 
  AND token = 'S9tEJZYWj1rqn29YhVqsd2PzcN79v+R6uDiQ6tShbuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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