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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6434d1e3c165ff4624ef0121f912ad28026c38866946ffcc068dc42706b5bb4d' 
  AND token = 'CVu2kCM9iHt72hhj7RrLMpDGmBkelOJdeYzeXD1e5IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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