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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9b91fd8f7127070e3bfe81414bcbef39dd47246f08d6b6ed51e0b0da41cf984' 
  AND token = 'dh4BxvQ5EDH5D+WMNVB2U5mdnhNjvNG8MG/Uo7W7uCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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