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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd3b2a55330cc2f3573d1945d9174898ed7282aa29db7132d948825f4a5c4cfb' 
  AND token = 'JcThE2Er7LeuvUNhemZEMBLqGM23a0Hq1mOm/K8k/Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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