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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f0fd54cf7d098a6764bc4aeeeb7b4853c68702c1a9ec1971bb09a82a65a5894' 
  AND token = 'ybBfEKu6q71eIoWtcMIgCNxXu7ojsUJw5aejoyl6+18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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