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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fab38ea388517c2d64bbd56c8ac7d1cc7cc0ad1662ee5e2637f9d2cb5ed61100' 
  AND token = 'fmmuZprKE5KefAiUJD+c4mZIF92HpWnTa1anTSNRFjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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