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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '352e8d5f2d650257cc4749b5b691b327217f20778a9061774849a6922655e127' 
  AND token = 'eTnKHTZZGVAk91E8WctIuitQh282h3jsGrV0MHRp2yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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