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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4f6e7a7b21736b83571ea3777d77d712f23e274d9d5c4f63b84146242ba004f' 
  AND token = '5myAHRbmC6zR6qA0XOZyCGLlj0UmA//XXz7o9R1eT8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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