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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dc430ef5559f2d2e0694de67447de109664eeeaa7eb9e875c22163bbabf78c0' 
  AND token = 'q4gFx33IHVrtsJc2pitFmCk35ZCJZp/FO6t+KT1Csi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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