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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af4ed98d194bfc4c9c09baff35e32d034a55ce38bd406f3a1547fbb960fd377a' 
  AND token = 'k/ZQnim3DORojtp2hwOk/iSOabT5xE1kOxyWppjN39s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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