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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a010082883da702923282912eb220143b13979581f4aae16eb80091aecff929d' 
  AND token = 'bSGNM6W0+59uGOOaEIS3ndZaBo7oaBLccitpIqrtpGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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