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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54e4fbf1d77d4ec4b8aca60fb4d1d10bb8f8dfa125a7a29817fdf3516b5d6b81' 
  AND token = 'X7H8UDZR874TcO272gs3H9KAJxMylYTznNiQ4ZGidvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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