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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebe47a95ddea315f96a374d8a7f1ccb6c0c181ab11e2695c45b0663867dc5615' 
  AND token = 'QkYAuz9j4BPMgAursIcfoV7HYW5A208kKos+/XMliTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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