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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05030beded65c2db655c5e241de5e8eb177930260e0643f5a879961830101c3f' 
  AND token = 'nNIECufTB6TLdiqeg3nHirp/8fdPoQE9tkcuU0U/F54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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