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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8bfb2204482412a7486663f1fd2ae903306d2f1482cc43f6002c24b88d4fd14' 
  AND token = '8pa1JdZR0rsCm5JArO861ViSsQC363S7eVZrV5SuLW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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