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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '352a1809062e525f7cad1427fc81666a429e10fa9750af05000f5368a0914f90' 
  AND token = 'QtZWrYVDReFU98Rc7oEWxyxuS4lRqvLUzimJBu7tsVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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