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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bdb2f17cca449cfd12870e95540440dcb9b99a4d667dbc06c7707bc1298f921' 
  AND token = 'FMZ2ir7GBxsrDVGJadUI7E+rvep/Fbra20CrwG7aKrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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