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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b1c97fa835d34837437175d60274bb105014cd7b2704b9294c740a9aeb7c367' 
  AND token = 'w8M8TnAHX2qOWt1Dc1+a6DVy0TbuZ/f5K5lBE0NH5bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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