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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e1455bb728e6ac1c4db6c9b66f4e24f566491da5276b858c23e05d990fa2ff0' 
  AND token = 'Ga+TiFhoUk5vEigTgL7nTLxxe9NrJOXuMdiLK1YHr54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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