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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb243f45bc754c4b6b672be165158bac15eca796eb88fbafa7706fe5416c3d62' 
  AND token = 'cNnOTOP3wSAkTrcvR+3nGQmtOTAwwnfhyrjyvVK9q6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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