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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60a40972ee1287459befc5e8fcee666e7e3542dd1e8d57559a8b31bd42d245a4' 
  AND token = 'ph6f9OrmW/zNNjcSvr5rRCaqWELmCPk92fmm3/ZKnPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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