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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb498cc6d8b1f6d6000abb4275f850c163f7b88eb3bf2fb0b5cc1affb5197d47' 
  AND token = 'lxHT23AeXn96jMnn4+PQ9pqoR1Esb7+00fJ0c4pUyks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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