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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '838346c6d66e3bef811cf5fd066f0b25247163eef709c9759b46263877085ea7' 
  AND token = 'TLE8koTIU4iHreTJyklflVyXXdcg5w4crDSKBdFV1Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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