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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be5a465de45c7141db33728462a8ac5201916c719e9ae75b4cc54e1c8cd144f1' 
  AND token = '0In8d24yBgv39ndp2+j8SmneH2nr3fIrFje986O1z0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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