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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14c9f63e3ce415feb84374ffd8b32e7135113336df6ddec9b975252ddcc558e4' 
  AND token = 'QnuDptbAfx0Whsb4YOaYup7bv1+8JE0lEd3dXzFw/64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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