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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d2e86d7a93b9108ed7b23037859c4f0d7ec18912d77a8cdbd58629e7ab4f7c1' 
  AND token = 'ApcPjoz4bT2+ENuglsuaalQJ3srx4plKCDnW4MlCqHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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