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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa15d467417cdbec67f0309c2960b43df547a037845cf0197d4ec53cf7c7015b' 
  AND token = '1PzfXd1ORiisNSqViQKFg0qGGgRgNNgh/cK8Ol5Cg2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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