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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de03263e78340b05e93ee437fa3cd677ae34b5f0ffc5b44a4854201c07eb2533' 
  AND token = 'HdBeaT8dmeohAbetEwZvc9iUFgF0naWXK2kA/tQEn3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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