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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbdbccf0e4f4c04303c61552822b333a9ad6a0d6a182af676f82cb18713c329b' 
  AND token = '1/zkaWHdiOOf8KtcAA1yLfLQhfCQmPvTpvN2AtLxF7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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