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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5263ad8bdca3440b231e84248e1173179f849b2032134ec48cae64753ceb25ec' 
  AND token = 'Vu9/C1c9JrLXD/kUkcrhdqOPJ8Roy5nVaqtOlisNr48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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