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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56aa71556678ce8ee0007446c1b871aed42caca91de4310584a2b8191f98bef7' 
  AND token = '60JwLQBwzC7h0xdu4lYPYDJSCTF8row7ZT283WKodRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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