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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '805c1ba2bad400baaf65af4666720b4e8dba426d0702ee21d32abffcf20440ce' 
  AND token = '3d+l8mW8uciHZ3FA8chRBC4aajOUqsFpXVC+7ILboEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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