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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08f8e919eb8c7ec4badc98af84bff4bd154c648a56931dd0d9c5881d534f4aaa' 
  AND token = 'L4r6Xi0tGY5tIMYkNQQzF8y1B2V1QmHUs7zrM/tvfz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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