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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83609de09401562902f2d2f21db666707d7d0cc9d94a5663837f0deb4bcaf177' 
  AND token = 'kQXZHcrcN+X8GbxYepCYhHifL0OorUrXpYyrer8n/lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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