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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e96c1af6f266f74dcd60cb7306449f86ff3139d0f1dc79f82602d03a074bb462' 
  AND token = 'xpSUiE3H26yY5db1fH+re53vvd49Qxw6GNw0VKSgVGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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