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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc851aeb857333ee4f2a4064413ec38c7c8749a7d58064aa5f4b4658f757c18c' 
  AND token = 'kH+EdhN/PBXLzbzHYTRcrgReKBIujPQ4tRymFs9L27k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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